docs: def iter_sections(self, order=Tree.ipreorder, neurite_order=NeuriteIter.FileOrder):
          '''iteration over section nodes
  
      Parameters:
          order: section iteration order within a given neurite. Must be one of:
              Tree.ipreorder: Depth-first pre-order iteration of tree nodes
              Tree.ipreorder: Depth-first post-order iteration of tree nodes
              Tree.iupstream: Iterate from a tree node to the root nodes
              Tree.ibifurcation_point: Iterator to bifurcation points
              Tree.ileaf: Iterator to all leaves of a tree
  
          neurite_order: order upon which neurites should be iterated. Values:
              - NeuriteIter.FileOrder: order of appearance in the file
              - NeuriteIter.NRN: NRN simulator order: soma -> axon -> basal -> apical
          '''
          return iter_sections(self, iterator_type=order, neurite_order=neurite_order)